New PDF release: Polyfluorenes

By Andrew C. Grimsdale, Klaus Müllen (auth.), Ullrich Scherf, Dieter Neher (eds.)

ISBN-10: 3540687335

ISBN-13: 9783540687337

ISBN-10: 3540687343

ISBN-13: 9783540687344

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1 below), so a probable structure for the defect in LPPPs is a ketone as in 112 (Scheme 51). As the ketone in 112 has more extended conjugation than in fluorenone (39) one would expect the emission from it to be bathochromically shifted, which is consistent with the long-wavelength emission from LPPPs occurring at 560–600 nm, and that from polyfluorenes at about 530 nm. C. Grimsdale · K. Müllen Scheme 51 Proposed emissive defect in ladder-type PPPs The ketone 112 presumably arises from oxidation of the methine bridge by oxygen from the air.

The key step is the polymer analogous Friedel-Crafts ringclosing reaction on the polyalcohol 104, obtained by the reduction of 103. This was found to proceed quickly and smoothly upon addition of borontrifluoride to a solution of 104 in dichloromethane. The reaction appeared to be complete by both NMR and MALDI-TOF analysis, indicating the presence of less than 1% of defects due to incomplete ring closure. C. Grimsdale · K. Müllen ber average molecular weights (Mn ) of up to 50 000 g/mol have been obtained corresponding to about 150 phenylene rings.

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Polyfluorenes by Andrew C. Grimsdale, Klaus Müllen (auth.), Ullrich Scherf, Dieter Neher (eds.)


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